Installing Curator add-on with ElasticSearch on Ubuntu Focal Fossa

When attempting to install the Curator add-on with ElasticSearch, I am receiving an error on Ubuntu 20.04. The error states "The repository 'http://ppa.launchpad.net/webupd8team/java/ubuntu focal Release' does not have a Release file."

I followed the instructions on the Curator page here: https://www.elastic.co/guide/en/elasticsearch/client/curator/current/apt-repository.html